Quoting 

I fully understand that at only 279 euros per indicator and due to the large number of indicators you offer for sale, you do not provide programming support but a simple example per indicator where you specify everything that the 'we can recover by code would have been welcome and a lot better seller for beginners like me.

we already gave that a shot. We had some free open-source auto-strategies up on our site demonstrating how to use a particular indicator in an automated strategy. We made it clear that these were just basic examples to help folks get started with the coding, and that we wouldn't be able to offer any programming assistance to them. But we still got bombarded with emails every day from people freaking out because they lacked coding knowledge and demanded that we create the automated strategy they wanted. Long story short, we had to remove those examples from the website.

trendisyourfriend 

Don't you provide the public method's names which can be called when using your indicators? I think this was the main point.

That's not really needed. All you gotta know is how to make a new instance and then you can use the indicator's plots. It's actually pretty easy to get this info, and I'll explain how in a sec.
Just so you know, other vendors aren't giving out this info either. Why? Because it's not really necessary.

Anyway, I recommend using the NinjaTrader databox to study the plot values and find what you need. I use it all the time and it's a great way to check out plots from third-party indicators.
We do have descriptions of plot values for most of our indicators on our site, but sometimes it's just easier to see them on your own chart.

Now, if you wanna make a new instance for ANY indicator in your script:

1) Use Visual Studio. It's got intellisense and will show you how to create a new instance of each indicator.
2) Or make a basic strategy with the NinjaScript Strategy Builder. It doesn't have to do much, but when you add the indicator to it (just add some bogus rule which uses one of the indicator plots), it'll generate the code for you on how to create an instance of it.

Even though my answer might seem ironic, I totally confirm that I understand your business strategy. I only find it a pity that each indicator is not accompanied by an example of use.
I also wanted to thank you for your tip with the strategy builder because even that I hadn't thought of.